|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Powder Materials Processing and Fundamental Understanding
||Influence of Powder Reuse in LPBF on the Attributes of SS316L Particles and Powder Beds
||Timothee Delacroix, Fernando Lomello, Frédéric Schuster, Hicham Maskrot, Jean-Paul Garandet
|On-Site Speaker (Planned)
In Laser Powder Bed Fusion (LPBF), a significant amount of metallic powder is not solidified by the laser beam. The ability to reuse metal powder efficiently strongly impact costs and material yield. However, some of the recovered powder is exposed to high temperatures during the manufacturing process in an imperfectly controlled environment. Therefore, there is a need to study and understand powder degradation during the process and the effect after multiple reuses. One batch of gas-atomized 316L stainless steel powder was used, recovered, sieved and reused to produce 15 successive LPBF prints without addition of virgin powder. Recycled powders were characterized throughout each iteration to investigate changes in particles morphology, rheology, crystal structure and chemical composition. A gradual increase of oxygen content was observed, along with the presence of colored and oxidized particles. Powder bed layers were also studied with scan acquisitions at very high spatial resolution.
||Additive Manufacturing, Powder Materials, Characterization